Threshold Ring Signatures and Applications to Ad-hoc Groups
CRYPTO '02 Proceedings of the 22nd Annual International Cryptology Conference on Advances in Cryptology
Dynamic Threshold Public-Key Encryption
CRYPTO 2008 Proceedings of the 28th Annual conference on Cryptology: Advances in Cryptology
Simultaneous Hardcore Bits and Cryptography against Memory Attacks
TCC '09 Proceedings of the 6th Theory of Cryptography Conference on Theory of Cryptography
Public-Key Cryptosystems Resilient to Key Leakage
CRYPTO '09 Proceedings of the 29th Annual International Cryptology Conference on Advances in Cryptology
Dual System Encryption: Realizing Fully Secure IBE and HIBE under Simple Assumptions
CRYPTO '09 Proceedings of the 29th Annual International Cryptology Conference on Advances in Cryptology
Practical leakage-resilient identity-based encryption from simple assumptions
Proceedings of the 17th ACM conference on Computer and communications security
Overcoming the Hole in the Bucket: Public-Key Cryptography Resilient to Continual Memory Leakage
FOCS '10 Proceedings of the 2010 IEEE 51st Annual Symposium on Foundations of Computer Science
Cryptography against Continuous Memory Attacks
FOCS '10 Proceedings of the 2010 IEEE 51st Annual Symposium on Foundations of Computer Science
Threshold ring signature without random oracles
Proceedings of the 6th ACM Symposium on Information, Computer and Communications Security
Achieving leakage resilience through dual system encryption
TCC'11 Proceedings of the 8th conference on Theory of cryptography
Fully leakage-resilient signatures
EUROCRYPT'11 Proceedings of the 30th Annual international conference on Theory and applications of cryptographic techniques: advances in cryptology
Storing Secrets on Continually Leaky Devices
FOCS '11 Proceedings of the 2011 IEEE 52nd Annual Symposium on Foundations of Computer Science
Public-key encryption schemes with auxiliary inputs
TCC'10 Proceedings of the 7th international conference on Theory of Cryptography
Efficient identity-based encryption without random oracles
EUROCRYPT'05 Proceedings of the 24th annual international conference on Theory and Applications of Cryptographic Techniques
Public-Key encryption in the bounded-retrieval model
EUROCRYPT'10 Proceedings of the 29th Annual international conference on Theory and Applications of Cryptographic Techniques
Identity-based encryption resilient to continual auxiliary leakage
EUROCRYPT'12 Proceedings of the 31st Annual international conference on Theory and Applications of Cryptographic Techniques
Distributed public key schemes secure against continual leakage
PODC '12 Proceedings of the 2012 ACM symposium on Principles of distributed computing
Fully leakage-resilient signatures with auxiliary inputs
ACISP'12 Proceedings of the 17th Australasian conference on Information Security and Privacy
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With the goal of ensuring availability of security services such as encryption and authentication, we initiate the study of leakage-resilient threshold cryptography, for achieving formal security guarantee under various key-exposure attacks. A distinctive property of threshold cryptosystems is that a threshold number of secret keys are used in the main cryptographic function such as decryption or signing. Even though some existing security models allow leakages of multiple keys of different users, these keys are not used simultaneously to decrypt a ciphertext or sign a message. In this paper, we introduce the multi-key leakage-resilient security model for threshold cryptography. We also propose constructions with formal security guarantee with respect to our model, one is a dynamic threshold public key encryption scheme and another is a threshold ring signature scheme.